15x+400=700

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Solution for 15x+400=700 equation: 



15x+400=700

We move all terms to the left:

15x+400-(700)=0

We add all the numbers together, and all the variables

15x-300=0

We move all terms containing x to the left, all other terms to the right

15x=300

x=300/15

x=20

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